+1, Bill is dead on.

BioSpira is expensive. You are just throwing money at the situation now, which is good for the fish store, and not for you or the fish. MAAST is great for learning, and for the most part, people are here to help.

You need to stabilize your system, and there are ways of doing so, but you are looking at expense and labor. What I would look at to diffuse the situation at this point is looking for....
Constant water changes, if not daily, weekly, until your system starts to stabilize.
If it doesn't stabilize within two weeks, you should start to look at purchasing more live rock and live sand, assuming that you do not already have MORE than 1 LB per gallon (I personally recommend 1.5#s per gallon, not just 1 LB/g) and a good amount of sand, at least 1 1/2". I have about 180lbs of sand in 100g of total water volume. Rock is around 200lbs.

This should be a MAJOR help in the overall health of your system. I know alot of people will completely disagree and say that what I recommend is overkill, but if you have to go without a skimmer for any period of time, it's best to have a failsafe, and having this much rock and sand is VERY important in a system with a large bioload.

Next of course would be a skimmer, and DO NOT get a cheapy. The cheapest I would get would be an Octo, but I would place my faith in the Euro Reefs, Deltecs, ASM, Bubble Kings, and one or two others that are slipping my mind at the moment.

Instead of buying biospira, but some LR is basically what I am getting at. Make sure it is fully cured! LR and water changes should make a significant impact to your system, and will benefit your tank, and your experience for a good time to come...